解决方案

内容-性格依恋似乎对我很管用:

self.set_header("Content-Type", "application/json")
self.set_header("Content-Disposition", 'attachment; filename=learned_data.json')

解决方案

应用程序/八进制

我有类似的事情发生在我的JSON，对我来说，在服务器端，我设置头 自我。set_header(“内容类型”、“application / json”) 但是当我把它改成:

self.set_header("Content-Type", "application/octet-stream")

它会自动下载。

还要知道，为了让文件仍然保持.json后缀，你需要在文件名头文件:

self.set_header("Content-Disposition", 'filename=learned_data.json')

Another approach instead of saving the file on the server and retrieving it, is to use .NET 4.0+ ObjectCache with a short expiration until the second Action (at which time it can be definitively dumped). The reason that I want to use JQuery Ajax to do the call, is that it is asynchronous. Building my dynamic PDF file takes quite a bit of time, and I display a busy spinner dialog during that time (it also allows other work to be done). The approach of using the data returned in the "success:" to create a Blob does not work reliably. It depends on the content of the PDF file. It is easily corrupted by data in the response, if it is not completely textual which is all that Ajax can handle.

这个问题被问到已经有一段时间了，但我也有同样的挑战，想要分享我的解决方案。它使用了其他答案中的元素，但我无法找到它的全部。它不使用表单或iframe，但它需要post/get请求对。它不是在请求之间保存文件，而是保存post数据。这似乎既简单又有效。

客户端

var apples = new Array(); 
// construct data - replace with your own
$.ajax({
   type: "POST",
   url: '/Home/Download',
   data: JSON.stringify(apples),
   contentType: "application/json",
   dataType: "text",

   success: function (data) {
      var url = '/Home/Download?id=' + data;
      window.location = url;
   });
});

服务器

[HttpPost]
// called first
public ActionResult Download(Apple[] apples)
{
   string json = new JavaScriptSerializer().Serialize(apples);
   string id = Guid.NewGuid().ToString();
   string path = Server.MapPath(string.Format("~/temp/{0}.json", id));
   System.IO.File.WriteAllText(path, json);

   return Content(id);
}

// called next
public ActionResult Download(string id)
{
   string path = Server.MapPath(string.Format("~/temp/{0}.json", id));
   string json = System.IO.File.ReadAllText(path);
   System.IO.File.Delete(path);
   Apple[] apples = new JavaScriptSerializer().Deserialize<Apple[]>(json);

   // work with apples to build your file in memory
   byte[] file = createPdf(apples); 

   Response.AddHeader("Content-Disposition", "attachment; filename=juicy.pdf");
   return File(file, "application/pdf");
}

我想我已经接近了，但是有些东西正在破坏文件(图像)，无论如何，也许有人可以揭示这种方法的问题

$.ajax({
            url: '/GenerateImageFile',
            type: 'POST',
            cache: false,
            data: obj,
            dataType: "text",
            success: function (data, status, xhr) {
                let blob = new Blob([data], { type: "image/jpeg" });

                let a = document.createElement('a');
                a.href = window.URL.createObjectURL(blob);
                a.download = "test.jpg";
                document.body.appendChild(a);
                a.click();
                document.body.removeChild(a);
                window.URL.removeObjectURL(a.href);
            },
            complete: function () {

            },
            beforeSend: function () {

            }
        });

我一直在尝试使用blobs的另一种选择。我已经设法让它下载文本文档，我下载了PDF文件(但他们是损坏的)。

使用blob API，你可以做以下事情:

$.post(/*...*/,function (result)
{
    var blob=new Blob([result]);
    var link=document.createElement('a');
    link.href=window.URL.createObjectURL(blob);
    link.download="myFileName.txt";
    link.click();

});

这是IE 10+， Chrome 8+， FF 4+。参见https://developer.mozilla.org/en-US/docs/Web/API/URL.createObjectURL

它只能在Chrome、Firefox和Opera中下载文件。它使用锚标记上的下载属性强制浏览器下载它。

使用HTML5，你可以创建一个锚点并点击它。不需要将它作为子文件添加到文档中。

const a = document.createElement('a');
a.download = '';
a.href = urlForPdfFile;
a.click();

全部完成。

如果你想要下载一个特殊的名字，只需要在download属性中传递它:

const a = document.createElement('a');
a.download = 'my-special-name.pdf';
a.href = urlForPdfFile;
a.click();